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Fix collinear with distorted case #9

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Merged
merged 1 commit into from
Oct 5, 2025
Merged

Fix collinear with distorted case #9

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3 changes: 2 additions & 1 deletion src/spinspg/group.py
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Original file line number Diff line number Diff line change
Expand Up @@ -319,7 +319,8 @@ def purify_spin_rotation(
# mirror along axis
return _get_mirror_along_axis(axis)
else:
raise ValueError("Given spin rotation does not normalize the spin-only group.")
# Tiny magnetic moment fluctuation may cause this case
return W
elif spin_only_group.spin_only_group_type == SpinOnlyGroupType.COPLANAR:
# normalizer of spin_only_group: infty/mm
mirror = _get_mirror_along_axis(spin_only_group.axis)
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